Microsoft Defender

Display a list of cmdlets contained in the Defender module

Get-Command -Module Defender

> Get-Command -Module Defender

CommandType     Name                                               Version    Source
-----------     ----                                               -------    ------
Function        Add-MpPreference                                   1.0        Defender
Function        Get-MpComputerStatus                               1.0        Defender
Function        Get-MpPreference                                   1.0        Defender
Function        Get-MpThreat                                       1.0        Defender
Function        Get-MpThreatCatalog                                1.0        Defender
Function        Get-MpThreatDetection                              1.0        Defender
Function        Remove-MpPreference                                1.0        Defender
Function        Remove-MpThreat                                    1.0        Defender
Function        Set-MpPreference                                   1.0        Defender
Function        Start-MpRollback                                   1.0        Defender
Function        Start-MpScan                                       1.0        Defender
Function        Start-MpWDOScan                                    1.0        Defender
Function        Update-MpSignature                                 1.0        Defender

Check for running Microsoft Defender services

Get-Service SecurityHealthService, WinDefend, Sense, WdNisSvc | Select-Object Name,DisplayName,Status

Get-MpComputerStatus allows you to display the current status of Windows Defender: enabled options, virus definition date and version, last scan time, and others.

To quickly check if Windows Defender is running on your computer and find out the last antivirus definition update date, run the following PowerShell command:

Get-MpComputerStatus | Select-Object -Property Antivirusenabled,AMServiceEnabled,AntispywareEnabled,BehaviorMonitorEnabled,IoavProtectionEnabled,NISEnabled,OnAccessProtectionEnabled,RealTimeProtectionEnabled,AntivirusSignatureLastUpdated

Disable Realtime monitoring altogether

Set-MpPreference -DisableRealtimeMonitoring $true

References

How to Disable, Enable, and Manage Microsoft Defender Using PowerShell? – TheITBrosTheITBros.com